[GitHub] dukescript opened a new pull request #824: Enable source=1.8 for Java Frontend Web Application

[GitBox <gi...@apache.org>]

dukescript opened a new pull request #824: Enable source=1.8 for Java Frontend Web Application
URL: https://github.com/apache/incubator-netbeans/pull/824
 
 
   Apache NetBeans 9.0 provides **Java Frontend Application** which can be deployed to desktop, Android, iOS and also Web. When compiling for web, only a subset of JDK8 APIs is available. To make sure the IDE and the runtime agree on the same classes, it is useful to configure compiler plugin like this:
   ```xml
           <maven.compiler.source>1.8</maven.compiler.source>
           <maven.compiler.target>1.8</maven.compiler.target>
       </properties>
       <build>
           <plugins>
               <plugin>
                   <groupId>org.apache.maven.plugins</groupId>
                   <artifactId>maven-compiler-plugin</artifactId>
                   <version>3.8.0</version>
                   <configuration>
                       <compilerArguments>
                           <bootclasspath>netbeans.ignore.jdk.bootclasspath</bootclasspath>
                       </compilerArguments>
                   </configuration>
               </plugin>
   ```
   Then `rt.jar` is ignored and only libraries from dependencies are placed on `javac` compilation paths. However in such mode the IDE complains that lamda functions aren't supported. This is what appears in the log file:
   ```
   Even though the source level of code/src/main/resources is set to: 1.8, 
   java.util.stream.Streams cannot be found on the bootclasspath: 
   incubator-netbeans/netbeans.ignore.jdk.bootclasspath
   Changing source level to 1.7
   ```
   That is correct - `Streams` class isn't present in the web emulation layer. However that should not be a reason for disabling 1.8 features. All that is needed is presence of `LambdaMetafactory` and then support for lamda functions may remain on.
   
   This PR changes the detection system.

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